I was playing DST with my GF, side to side with LAN, but suddenly (actually after I scanned her PC with YetAnotherCleaner program) we couldn't see each other through LAN anymore.
We tried to disable our AV programs, even our Firewalls but the result remained the same. We are playing in online now but the connection is not good as it was with LAN.
How can we resolve this issue and return to play on LAN?
We played for several hours in the room with LAN connection, then we used YAC to make one of the computers more efficent, then LAN is no more..